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Demonstrators throw Molotov cocktails, the police respond with tear gas and stun grenades.
A previously peaceful protest rally escalated in Athens.
After the serious train accident, anger is growing in Greece.
Syntagma Square, Athens / Greece
Demonstrators throw Molotov cocktails, the police respond with stun grenades and tear gas.
Violent clashes broke out between protesters and the police on Sunday in Syntagma Square, directly in front of the Parliament in Athens, on the sidelines of a demonstration over Tuesday's devastating train accident.
A small group started throwing incendiary devices at the police - the situation quickly escalated in the late afternoon.
About 12,000 people took part in the protest rally, which had previously been peaceful.
Three unions representing the country's railway workers called for the rally.
Thousands of students and railway employees had already gathered the night before.
They chanted slogans against the government and its economic policies - which they believe are responsible for the accident.
They commemorated the dead with songs and lanterns.
In the worst train accident in the history of Greece, two trains collided head-on on the route between Athens and the port city of Thessaloniki on Tuesday evening;
When an intercity passenger train and an oncoming freight train collided near the town of Larissa, 57 people died and dozens were injured.
Many of the dead were students - nine fatalities were train attendants.
After the accident, the station master was arrested, he admitted that he had missed the rerouting of the trains.
But for many of the demonstrators, the blame lies primarily with the ranks of the government: They accuse the politicians of having criminally neglected the modernization of the rail network.
The Greek Prime Minister apologized extensively on social media - but that did not calm people here in Athens: This was made clear by the renewed protests on Sunday.